/**
 * HardExample.java
 * Example for COM1317 project
 * By Jing Shan
 **/

import java.util.Random;

class HardExample implements Runnable{
    int MyId=-1;
    Random myRand;
   
    MyResource pubResource;

    HardExample(int i, MyResource r){
	MyId = i;
	pubResource = r;
    }

    public void run(){
	System.out.println("thread "+MyId+" starts.");

	myRand = new Random(System.currentTimeMillis());

	for(int i=0;i<10;i++){
	    System.out.println("begin synchronize");

	    synchronized (pubResource){
		pubResource.increase(100);
		System.out.println("resource value is changed to "+ pubResource.value());
	    }

	    System.out.println("end synchronize");

	    try{
		int sleepTime = myRand.nextInt(1000);
		System.out.println("trying to sleep "+sleepTime +" time");
		Thread.sleep(sleepTime);
	    }catch (InterruptedException e){
		System.out.println("thread "+MyId+" is interrupted");
	    }

	}

	System.out.println("thread"+ MyId+" terminates");

    }
}